The predominant ring structure of glucose in aqueous solution is
called

Options

A. cyclopentyl
B. furanose
C. pyranose
D. none of the above

Explanation

To solve the question regarding the predominant ring structure of glucose in aqueous solution, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Glucose Structure**: Glucose is a hexose sugar, which means it has six carbon atoms. In its open-chain form, glucose has an aldehyde group at one end.

2. **Formation of Ring Structure**: In aqueous solution, glucose can cyclize to form a ring structure. This occurs when the hydroxyl group on the fifth carbon (C-5) reacts with the carbonyl carbon (C-1), leading to the formation of a hemiacetal.

3. **Identifying the Type of Ring**: The ring formed is a six-membered structure, which contains one oxygen atom and five carbon atoms. This type of ring is similar to the structure of pyran, hence it is referred to as a "pyranose" form.

4. **Predominant Form in Solution**: In aqueous solution, the predominant form of glucose is the β-D-glucopyranose, which accounts for about 64% of the glucose present.

5. **Conclusion**: Therefore, the predominant ring structure of glucose in aqueous solution is called "pyranose".

### Final Answer:
The predominant ring structure of glucose in aqueous solution is called **pyranose**.

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